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ReflectDemo.java
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ReflectDemo.java
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package com.flexible.ioc.reflect;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
public class ReflectDemo {
public static void main(String[] args) throws ClassNotFoundException, NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException {
//��װ������ȡCar�����
ClassLoader loader = Thread.currentThread().getContextClassLoader();
Class clazz = loader.loadClass("com.flexible.ioc.reflect.Person");
//��ȡ���Ĭ�Ϲ�����������ͨ����ʵ����
// Constructor constructor = clazz.getDeclaredConstructor((Class[]) null);
Constructor constructor = clazz.getDeclaredConstructor((Class[]) null);
Person person = (Person) constructor.newInstance();
//ͨ�����䷽����������
Method setUserName = clazz.getMethod("setUserName", String.class);
setUserName.invoke(person, "zhangsan");
Method setUserAge = clazz.getMethod("setUserAge", Integer.class);
setUserAge.invoke(person, 26);
System.out.println(person.toString());
// System.out.println(setUserAge.getReturnType());//��ȡ����ֵ����
// System.out.println(setUserAge.getParameterTypes());//��ȡ��������
System.out.println(setUserAge.getParameterAnnotations());
System.out.println(loader);
System.out.println(loader.getParent());
//������������ClassLoader�����࣬��C++д�ģ�����ȡ��
System.out.println(loader.getParent().getParent());
// 获取所有得属性
Field[] declaredFields = clazz.getDeclaredFields();
for (Field field:declaredFields) {
//将私有属性设置为可以操作,而不需要通过类得方法操作属性。
field.setAccessible(true);
System.out.println(field.getName());
if (field.getName()=="userName"){
field.set(person,"test1");
}else if (field.getName()=="userAge"){
field.set(person,28);
}
}
System.out.println(person.toString());
}
}